Thousands go pantsless for 'No Pants Subway Ride'

Chris Quinn
| on January 11, 2015

Photo: DANIEL MIHAILESCU, Getty Images

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Young people, stripped to their underpants, wait for the subway as they take part in Romania's first edition of the "No pants subway ride day" organized in Bucharest January 11, 2015. The No Pants Subway RideYoung people, stripped to their underpants, wait for the subway as they take part in Romania's first edition of the "No pants subway ride day" organized in Bucharest January 11, 2015. The No Pants Subway Ride is an annual event staged across major cities of the World every January. The mission started as a small prank with seven guys and has grown into an international celebration of silliness, with dozens of cities around the world participating each year. AFP PHOTO / DANIEL MIHAILESCU

Photo: Matej Divizna, Getty Images

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PRAGUE, CZECH REPUBLIC - JANUARY 11: A participant of the No Pants Subway Ride waits for a train on January 11, 2015 in Prague, Czech Republic. The annual event, in which participants board a subway car inPRAGUE, CZECH REPUBLIC - JANUARY 11: A participant of the No Pants Subway Ride waits for a train on January 11, 2015 in Prague, Czech Republic. The annual event, in which participants board a subway car in January while not wearing any pants while behaving as though they do not know each other, began as a joke by the public prank group Improv Everywhere in New York City and has since spread around the world.

Photo: MANDEL NGAN, Getty Images

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A participant in the No Pants Subway Ride DC, waits for a train at the Gallery Place - Chinatown stop on January 11, 2015 in Washington, DC. The No Pants Subway Ride was in an annual event started in 2002 byA participant in the No Pants Subway Ride DC, waits for a train at the Gallery Place - Chinatown stop on January 11, 2015 in Washington, DC. The No Pants Subway Ride was in an annual event started in 2002 by Improv Everywhere in New York. AFP PHOTO/Mandel NGAN

Photo: MANDEL NGAN, Getty Images

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A participant in the No Pants Subway Ride DC waits for a train at the Gallery Place - Chinatown station on January 11, 2015 in Washington, DC. The No Pants Subway Ride is an annual which was started in 2002 byA participant in the No Pants Subway Ride DC waits for a train at the Gallery Place - Chinatown station on January 11, 2015 in Washington, DC. The No Pants Subway Ride is an annual which was started in 2002 by Improv Everywhere in New York. AFP PHOTO/Mandel NGAN

Photo: TIMOTHY A. CLARY, Getty Images

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Some riders in their underwear take part in the No Pants Subway Ride in New York subway on January 11, 2015 in New York. The No Pants Subway Ride is an annual which was started in 2002 by Improv Everywhere inSome riders in their underwear take part in the No Pants Subway Ride in New York subway on January 11, 2015 in New York. The No Pants Subway Ride is an annual which was started in 2002 by Improv Everywhere in New York, the goal is for riders to get on the subway train dressed in normal winter clothes without pants and keep a straight face. AFP PHOTO / TIMOTHY A. CLARY

Photo: TIMOTHY A. CLARY, Getty Images

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Some participants in the No Pants Subway Ride wait for a train in their underwear in New York subway on January 11, 2015 in New York. The No Pants Subway Ride is an annual which was started in 2002 by ImprovSome participants in the No Pants Subway Ride wait for a train in their underwear in New York subway on January 11, 2015 in New York. The No Pants Subway Ride is an annual which was started in 2002 by Improv Everywhere in New York, the goal is for riders to get on the subway train dressed in normal winter clothes without pants and keep a straight face. AFP PHOTO / TIMOTHY A. CLARY

Photo: TIMOTHY A. CLARY, Getty Images

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Some participants in the No Pants Subway Ride wait for a train in their underwear in New York subway on January 11, 2015 in New York. The No Pants Subway Ride is an annual which was started in 2002 by ImprovSome participants in the No Pants Subway Ride wait for a train in their underwear in New York subway on January 11, 2015 in New York. The No Pants Subway Ride is an annual which was started in 2002 by Improv Everywhere in New York, the goal is for riders to get on the subway train dressed in normal winter clothes without pants and keep a straight face. AFP PHOTO / TIMOTHY A. CLARY

Photo: TIMOTHY A. CLARY, Getty Images

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Some participants in the No Pants Subway Ride wait for a train in their underwear in New York subway on January 11, 2015 in New York. The No Pants Subway Ride is an annual which was started in 2002 by ImprovSome participants in the No Pants Subway Ride wait for a train in their underwear in New York subway on January 11, 2015 in New York. The No Pants Subway Ride is an annual which was started in 2002 by Improv Everywhere in New York, the goal is for riders to get on the subway train dressed in normal winter clothes without pants and keep a straight face. AFP PHOTO / TIMOTHY A. CLARY

Photo: Vadim Ghirda, AP Photo

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Youngsters, taking part in the first edition of the No Pants Subway Ride, are backdropped by a painting depicting early 18th century Romanian ruler Constantin Brancoveanu as a saint, in Bucharest, Romania,Youngsters, taking part in the first edition of the No Pants Subway Ride, are backdropped by a painting depicting early 18th century Romanian ruler Constantin Brancoveanu as a saint, in Bucharest, Romania, Sunday, Jan. 11, 2015. The No Pants Subway Ride began in 2002 in New York as a stunt and has taken place in cities around the world since then. Organizers call it �an international celebration of silliness� and are organizing it in dozens of cities on Sunday.

Photo: Scott Strazzante, The Chronicle

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No Pants! Subway Ride 2015 participants wait to board a BART train at Powell Street station in San Francisco, Calif. on Sunday, January 11, 2015.

Photo: Scott Strazzante, The Chronicle

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Jessie Norden and Emon Ryan kiss in Yerna Buena Gardens before the start of No Pants! Subway Ride 2015 in San Francisco, Calif. on Sunday, January 11, 2015.

Photo: Scott Strazzante, The Chronicle

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Yoyo Chen and Chia Liu (left) cross Mission Street on their way to the Powell Street BART station during No Pants! Subway Ride 2015 in San Francisco, Calif. on Sunday, January 11, 2015.

Photo: Scott Strazzante, The Chronicle

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Jen Parkes (left) and Caty Everett head down to board a BART train at Powell Street station during No Pants! Subway Ride 2015 in San Francisco, Calif. on Sunday, January 11, 2015.

Photo: Scott Strazzante, The Chronicle

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Daniel Salcedo (left) and Brittany Wagner pose for a group photo in Yerba Buena Gardens during No Pants! Subway Ride 2015 in San Francisco, Calif. on Sunday, January 11, 2015.

Photo: Scott Strazzante, The Chronicle

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As Leo Mederos plays a song, No Pants! Subway Ride 2015 participants dance in Clarion Alley in the Mission District in San Francisco, Calif. on Sunday, January 11, 2015.

Photo: Scott Strazzante, The Chronicle

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Abigail Aragon (red coat) dances in Clarion Alley in the Mission District during No Pants! Subway Ride 2015 in San Francisco, Calif. on Sunday, January 11, 2015.

Photo: Scott Strazzante, The Chronicle

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Caty Everett and Jen Parkes ride a BART train to the Mission District during No Pants! Subway Ride 2015 in San Francisco, Calif. on Sunday, January 11, 2015.

Photo: Scott Strazzante, The Chronicle

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As Jessica Leung (right) and Asia DeJesus walk past, a woman on Mission Street reacts during No Pants! Subway Ride 2015 in San Francisco, Calif. on Sunday, January 11, 2015.

Photo: Kathy Willens, Associated Press

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A pantless woman laughs as she walks into the Union Square subway station during the annual No Pants Subway Ride, Sunday, Jan. 11, 2015, in New York. The No Pants Subway Ride began in 2002 in New York as aA pantless woman laughs as she walks into the Union Square subway station during the annual No Pants Subway Ride, Sunday, Jan. 11, 2015, in New York. The No Pants Subway Ride began in 2002 in New York as a public prank and has since been celebrated by commuters around the world. (AP Photo/Kathy Willens)

Photo: Kathy Willens, AP Photo

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People disrobe in a subway station during the annual No Pants Subway Ride, Sunday, Jan. 11, 2015, in New York. The No Pants Subway Ride began in 2002 in New York as a public prank and has since been celebratedPeople disrobe in a subway station during the annual No Pants Subway Ride, Sunday, Jan. 11, 2015, in New York. The No Pants Subway Ride began in 2002 in New York as a public prank and has since been celebrated by commuters around the world.

Photo: Vadim Ghirda, AP Photo

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A girl rides on a train as she takes part in the first edition of the No Pants Subway Ride in Bucharest, Romania, Sunday, Jan. 11, 2015. The No Pants Subway Ride began in 2002 in New York as a stunt and hasA girl rides on a train as she takes part in the first edition of the No Pants Subway Ride in Bucharest, Romania, Sunday, Jan. 11, 2015. The No Pants Subway Ride began in 2002 in New York as a stunt and has taken place in cities around the world since then. Organizers call it �an international celebration of silliness� and are organizing it in dozens of cities on Sunday.

Photo: Kathy Willens, AP Photo

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A pantless woman laughs as she walks into the Union Square subway station during the annual No Pants Subway Ride, Sunday, Jan. 11, 2015, in New York. The No Pants Subway Ride began in 2002 in New York as aA pantless woman laughs as she walks into the Union Square subway station during the annual No Pants Subway Ride, Sunday, Jan. 11, 2015, in New York. The No Pants Subway Ride began in 2002 in New York as a public prank and has since been celebrated by commuters around the world.

Photo: MANDEL NGAN, Getty Images

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A participant in the No Pants Subway Ride DC waits for a train at the Gallery Place - Chinatown station on January 11, 2015 in Washington, DC. The No Pants Subway Ride is an annual which was started in 2002 byA participant in the No Pants Subway Ride DC waits for a train at the Gallery Place - Chinatown station on January 11, 2015 in Washington, DC. The No Pants Subway Ride is an annual which was started in 2002 by Improv Everywhere in New York. AFP PHOTO/Mandel NGAN

Photo: MANDEL NGAN, Getty Images

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A participant in the No Pants Subway Ride DC waits for a train at the Gallery Place - Chinatown station on January 11, 2015 in Washington, DC. The No Pants Subway Ride is an annual event which was started inA participant in the No Pants Subway Ride DC waits for a train at the Gallery Place - Chinatown station on January 11, 2015 in Washington, DC. The No Pants Subway Ride is an annual event which was started in 2002 by Improv Everywhere in New York. AFP PHOTO/Mandel NGAN

Photo: Marco Ugarte, AP Photo

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A baby looks at a man not wearing pants as they wait for the train, during the annual "No Pants Subway Ride" in Mexico City, Sunday, Jan. 11, 2015. The annual No Pants Subway Ride began in 2002 in New York as aA baby looks at a man not wearing pants as they wait for the train, during the annual "No Pants Subway Ride" in Mexico City, Sunday, Jan. 11, 2015. The annual No Pants Subway Ride began in 2002 in New York as a stunt that organizers called �an international celebration of silliness,� and has spread to other cities.

Photo: Kathy Willens, AP Photo

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Bottomless commuters clown around during the annual No Pants Subway Ride, Sunday, Jan. 11, 2015, in New York. The No Pants Subway Ride began in 2002 in New York as a public prank and has since been celebratedBottomless commuters clown around during the annual No Pants Subway Ride, Sunday, Jan. 11, 2015, in New York. The No Pants Subway Ride began in 2002 in New York as a public prank and has since been celebrated by commuters around the world.

Photo: Kathy Willens, AP Photo

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Jessica Faustin, of Queens, New York, participates in the annual No Pants Subway Ride, Sunday, Jan. 11, 2015, in New York. The No Pants Subway Ride began in 2002 in New York as a public prank and has since beenJessica Faustin, of Queens, New York, participates in the annual No Pants Subway Ride, Sunday, Jan. 11, 2015, in New York. The No Pants Subway Ride began in 2002 in New York as a public prank and has since been celebrated by commuters around the world.

Photo: Vadim Ghirda, AP Photo

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Passengers sit next to youngsters riding on a train as they take part in the first edition of the No Pants Subway Ride in Bucharest, Romania, Sunday, Jan. 11, 2015. The No Pants Subway Ride began in 2002 in NewPassengers sit next to youngsters riding on a train as they take part in the first edition of the No Pants Subway Ride in Bucharest, Romania, Sunday, Jan. 11, 2015. The No Pants Subway Ride began in 2002 in New York as a stunt and has taken place in cities around the world since then. Organizers call it �an international celebration of silliness� and are organizing it in dozens of cities on Sunday.

Photo: Kathy Willens, AP Photo

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A woman riding the subway with her son laughs after realizing she encountered the annual No Pants Subway Ride, Sunday, Jan. 11, 2015, in New York. The No Pants Subway Ride began in 2002 in New York as a publicA woman riding the subway with her son laughs after realizing she encountered the annual No Pants Subway Ride, Sunday, Jan. 11, 2015, in New York. The No Pants Subway Ride began in 2002 in New York as a public prank and has since been celebrated by commuters around the world.

Photo: Kathy Willens, AP Photo

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Participants wait for a train during the annual No Pants Subway Ride, Sunday, Jan. 11, 2015, in New York. The No Pants Subway Ride began in 2002 in New York as a public prank and has since been celebrated byParticipants wait for a train during the annual No Pants Subway Ride, Sunday, Jan. 11, 2015, in New York. The No Pants Subway Ride began in 2002 in New York as a public prank and has since been celebrated by commuters around the world.

Photo: Czarek Sokolowski, AP Photo

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Participants in an international �no pants� stunt prepare to board a subway on Sunday Jan. 11, 2015. The stunt, which involves taking the subway without wearing trousers, took place Sunday across dozens ofParticipants in an international �no pants� stunt prepare to board a subway on Sunday Jan. 11, 2015. The stunt, which involves taking the subway without wearing trousers, took place Sunday across dozens of cities worldwide. Organizers call it a celebration of silliness. The prank took place in temperatures of 4 Celsius (37 Fahrenheit).

Photo: Kathy Willens, AP Photo

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A patriotic commuter waits for a train during the annual No Pants Subway Ride, Sunday, Jan. 11, 2015, in New York. The No Pants Subway Ride began in 2002 in New York as a public prank and has since beenA patriotic commuter waits for a train during the annual No Pants Subway Ride, Sunday, Jan. 11, 2015, in New York. The No Pants Subway Ride began in 2002 in New York as a public prank and has since been celebrated by commuters around the world.

Photo: Kathy Willens, AP Photo

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People don matching underwear during the annual No Pants Subway Ride, Sunday, Jan. 11, 2015, in New York. The No Pants Subway Ride began in 2002 in New York as a public prank and has since been celebrated byPeople don matching underwear during the annual No Pants Subway Ride, Sunday, Jan. 11, 2015, in New York. The No Pants Subway Ride began in 2002 in New York as a public prank and has since been celebrated by commuters around the world.

Photo: Kathy Willens, AP Photo

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Bottomless commuters wait for a subway train after shedding their garments during the annual No Pants Subway Ride, Sunday, Jan. 11, 2015, in New York. The annual event began in 2002 in New York as a publicBottomless commuters wait for a subway train after shedding their garments during the annual No Pants Subway Ride, Sunday, Jan. 11, 2015, in New York. The annual event began in 2002 in New York as a public prank and has since been celebrated by commuters around the world.

Photo: Kathy Willens, AP Photo

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Bottomless commuters participate in the annual No Pants Subway Ride, Sunday, Jan. 11, 2015, in New York. The No Pants Subway Ride began in 2002 in New York as a public prank and has since been celebrated byBottomless commuters participate in the annual No Pants Subway Ride, Sunday, Jan. 11, 2015, in New York. The No Pants Subway Ride began in 2002 in New York as a public prank and has since been celebrated by commuters around the world.

Photo: Marco Ugarte, AP Photo

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An elderly woman, left, looks at a man who lacks his pants during the annual "No Pants Subway Ride" at a subway station in Mexico City, Sunday, Jan. 11, 2015. The annual No Pants Subway Ride began in 2002 inAn elderly woman, left, looks at a man who lacks his pants during the annual "No Pants Subway Ride" at a subway station in Mexico City, Sunday, Jan. 11, 2015. The annual No Pants Subway Ride began in 2002 in New York as a stunt that organizers call �an international celebration of silliness,� and has spread to other cities.

Photo: Marco Ugarte, AP Photo

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A subway commuter takes part in the annual "No Pants Subway Ride" in Mexico City, Sunday, Jan. 11, 2015. The annual No Pants Subway Ride began in 2002 in New York as a stunt that organizers call �anA subway commuter takes part in the annual "No Pants Subway Ride" in Mexico City, Sunday, Jan. 11, 2015. The annual No Pants Subway Ride began in 2002 in New York as a stunt that organizers call �an international celebration of silliness,� and has spread to other cities.

Photo: MANJUNATH KIRAN, Getty Images

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Indian commuters, stripped to their underpants, participate in a No Pants Subway Ride on the metro in Bangalore on January 11, 2015. The No Pants Subway Ride is an annual event staged across major cities of theIndian commuters, stripped to their underpants, participate in a No Pants Subway Ride on the metro in Bangalore on January 11, 2015. The No Pants Subway Ride is an annual event staged across major cities of the World every January. The mission started as a small prank with seven guys and has grown into an international celebration of silliness, with dozens of cities around the world participating each year. The idea behind No Pants is simple - random passengers board a subway car at separate stops in the middle of winter without pants. AFP PHOTO / MANJUNATH KIRAN

Photo: Matej Divizna, Getty Images

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PRAGUE, CZECH REPUBLIC - JANUARY 11: A participant of the No Pants Subway Ride waits for a train on January 11, 2015 in Prague, Czech Republic. The annual event, in which participants board a subway car inPRAGUE, CZECH REPUBLIC - JANUARY 11: A participant of the No Pants Subway Ride waits for a train on January 11, 2015 in Prague, Czech Republic. The annual event, in which participants board a subway car in January while not wearing any pants while behaving as though they do not know each other, began as a joke by the public prank group Improv Everywhere in New York City and has since spread around the world.

Photo: DANIEL MIHAILESCU, Getty Images

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Young women, stripped to their underpants, sit in the subway as they take part in Romania's first edition of the "No pants subway ride day" organized in Bucharest January 11, 2015. The No Pants Subway Ride isYoung women, stripped to their underpants, sit in the subway as they take part in Romania's first edition of the "No pants subway ride day" organized in Bucharest January 11, 2015. The No Pants Subway Ride is an annual event staged across major cities of the World every January. The mission started as a small prank with seven guys and has grown into an international celebration of silliness, with dozens of cities around the world participating each year. AFP PHOTO / DANIEL MIHAILESCU

Photo: DANIEL MIHAILESCU, Getty Images

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Young people, stripped to their underpants, jump in the air while waiting for the subway as they take part in Romania's first edition of the "No pants subway ride day" organized in Bucharest January 11, 2015.Young people, stripped to their underpants, jump in the air while waiting for the subway as they take part in Romania's first edition of the "No pants subway ride day" organized in Bucharest January 11, 2015. The No Pants Subway Ride is an annual event staged across major cities of the World every January. The mission started as a small prank with seven guys and has grown into an international celebration of silliness, with dozens of cities around the world participating each year. AFP PHOTO / DANIEL MIHAILESCU

Photo: Matej Divizna, Getty Images

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PRAGUE, CZECH REPUBLIC - JANUARY 11: Participants of the No Pants Subway Ride ride a train on January 11, 2015 in Prague, Czech Republic. The annual event, in which participants board a subway car in JanuaryPRAGUE, CZECH REPUBLIC - JANUARY 11: Participants of the No Pants Subway Ride ride a train on January 11, 2015 in Prague, Czech Republic. The annual event, in which participants board a subway car in January while not wearing any pants while behaving as though they do not know each other, began as a joke by the public prank group Improv Everywhere in New York City and has since spread around the world.

Photo: LEON NEAL, Getty Images

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People take part in the annual "No Trousers On The Tube Day" event in central London on January 11, 2015. Originally started in the US, the international event, also known as the "No Pants Subway Ride" wasPeople take part in the annual "No Trousers On The Tube Day" event in central London on January 11, 2015. Originally started in the US, the international event, also known as the "No Pants Subway Ride" was created by improvisation group "Improv Everywhere" and sees people taking train journies while wearing no trousers, yet acting as normally as possible. AFP PHOTO / LEON NEAL

Photo: LEON NEAL, Getty Images

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People take part in the annual "No Trousers On The Tube Day" event in central London on January 11, 2015. Originally started in the US, the international event, also known as the "No Pants Subway Ride" wasPeople take part in the annual "No Trousers On The Tube Day" event in central London on January 11, 2015. Originally started in the US, the international event, also known as the "No Pants Subway Ride" was created by improvisation group "Improv Everywhere" and sees people taking train journies while wearing no trousers, yet acting as normally as possible. AFP PHOTO / LEON NEAL

Photo: LEON NEAL, Getty Images

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People take part in the annual "No Trousers On The Tube Day" event in central London on January 11, 2015. Originally started in the US, the international event, also known as the "No Pants Subway Ride" wasPeople take part in the annual "No Trousers On The Tube Day" event in central London on January 11, 2015. Originally started in the US, the international event, also known as the "No Pants Subway Ride" was created by improvisation group "Improv Everywhere" and sees people taking train journies while wearing no trousers, yet acting as normally as possible. AFP PHOTO / LEON NEAL

Photo: LEON NEAL, Getty Images

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People pose for a photograph before taking part in the annual "No Trousers On The Tube Day" event in central London on January 11, 2015. Originally started in the US, the international event, also known as thePeople pose for a photograph before taking part in the annual "No Trousers On The Tube Day" event in central London on January 11, 2015. Originally started in the US, the international event, also known as the "No Pants Subway Ride" was created by improvisation group "Improv Everywhere" and sees people taking train journies while wearing no trousers, yet acting as normally as possible. AFP PHOTO / LEON NEAL

Photo: LEON NEAL, Getty Images

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People take part in the annual "No Trousers On The Tube Day" event in central London on January 11, 2015. Originally started in the US, the international event, also known as the "No Pants Subway Ride" wasPeople take part in the annual "No Trousers On The Tube Day" event in central London on January 11, 2015. Originally started in the US, the international event, also known as the "No Pants Subway Ride" was created by improvisation group "Improv Everywhere" and sees people taking train journies while wearing no trousers, yet acting as normally as possible. AFP PHOTO / LEON NEAL

Photo: LEON NEAL, Getty Images

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People take part in the annual "No Trousers On The Tube Day" event in central London on January 11, 2015. Originally started in the US, the international event, also known as the "No Pants Subway Ride" wasPeople take part in the annual "No Trousers On The Tube Day" event in central London on January 11, 2015. Originally started in the US, the international event, also known as the "No Pants Subway Ride" was created by improvisation group "Improv Everywhere" and sees people taking train journies while wearing no trousers, yet acting as normally as possible. AFP PHOTO / LEON NEAL

Photo: LEON NEAL, Getty Images

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People take part in the annual "No Trousers On The Tube Day" event in central London on January 11, 2015. Originally started in the US, the international event, also known as the "No Pants Subway Ride" wasPeople take part in the annual "No Trousers On The Tube Day" event in central London on January 11, 2015. Originally started in the US, the international event, also known as the "No Pants Subway Ride" was created by improvisation group "Improv Everywhere" and sees people taking train journies while wearing no trousers, yet acting as normally as possible. AFP PHOTO / LEON NEAL

Photo: LEON NEAL, Getty Images

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People take part in the annual "No Trousers On The Tube Day" event in central London on January 11, 2015. Originally started in the US, the international event, also known as the "No Pants Subway Ride" wasPeople take part in the annual "No Trousers On The Tube Day" event in central London on January 11, 2015. Originally started in the US, the international event, also known as the "No Pants Subway Ride" was created by improvisation group "Improv Everywhere" and sees people taking train journies while wearing no trousers, yet acting as normally as possible. AFP PHOTO / LEON NEAL

Photo: MANDEL NGAN, Getty Images

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Participants in the No Pants Subway Ride DC, ride the Metro on January 11, 2015 in Washington, DC. The No Pants Subway Ride was in an annual event which was started in 2002 by Improv Everywhere in New York. AFPParticipants in the No Pants Subway Ride DC, ride the Metro on January 11, 2015 in Washington, DC. The No Pants Subway Ride was in an annual event which was started in 2002 by Improv Everywhere in New York. AFP PHOTO/Mandel NGAN

Photo: RONALDO SCHEMIDT, Getty Images

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People walk through a subway station during the worldwide 'No Pants Subway Ride' event in Mexico City on January 11, 2015. Originally started in the US, the international event known as the "No Pants SubwayPeople walk through a subway station during the worldwide 'No Pants Subway Ride' event in Mexico City on January 11, 2015. Originally started in the US, the international event known as the "No Pants Subway Ride" was created by improvisation group "Improv Everywhere" and sees people taking train trips wearing no trousers, yet acting as normally as possible. AFP PHOTO/RONALDO SCHEMIDT

Photo: RONALDO SCHEMIDT, Getty Images

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A couple kisses in the subway during the worldwide 'No Pants Subway Ride' event in Mexico City on January 11, 2015. Originally started in the US, the international event known as the "No Pants Subway Ride" wasA couple kisses in the subway during the worldwide 'No Pants Subway Ride' event in Mexico City on January 11, 2015. Originally started in the US, the international event known as the "No Pants Subway Ride" was created by improvisation group "Improv Everywhere" and sees people taking train trips wearing no trousers, yet acting as normally as possible. AFP PHOTO/RONALDO SCHEMIDT

Photo: RONALDO SCHEMIDT, Getty Images

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A man rides the subway during the worldwide 'No Pants Subway Ride' event in Mexico City on January 11, 2015. Originally started in the US, the international event known as the "No Pants Subway Ride" was createdA man rides the subway during the worldwide 'No Pants Subway Ride' event in Mexico City on January 11, 2015. Originally started in the US, the international event known as the "No Pants Subway Ride" was created by improvisation group "Improv Everywhere" and sees people taking train trips wearing no trousers, yet acting as normally as possible. AFP PHOTO/RONALDO SCHEMIDT

Photo: MANDEL NGAN, Getty Images

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A participant in the No Pants Subway Ride DC lifts a fellow participant while waiting for a train at the Gallery Place - Chinatown station on January 11, 2015 in Washington, DC. The No Pants Subway Ride was inA participant in the No Pants Subway Ride DC lifts a fellow participant while waiting for a train at the Gallery Place - Chinatown station on January 11, 2015 in Washington, DC. The No Pants Subway Ride was in an annual event which was started in 2002 by Improv Everywhere in New York. AFP PHOTO/Mandel NGAN

Photo: MANDEL NGAN, Getty Images

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Participants in the No Pants Subway Ride DC are seen on a train on January 11, 2015 in Washington, DC. The No Pants Subway Ride was in an annual event which was started in 2002 by Improv Everywhere in New York.Participants in the No Pants Subway Ride DC are seen on a train on January 11, 2015 in Washington, DC. The No Pants Subway Ride was in an annual event which was started in 2002 by Improv Everywhere in New York. AFP PHOTO/Mandel NGAN

Photo: TIMOTHY A. CLARY, Getty Images

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A participant in the No Pants Subway Ride waits for a train next to police officers in New York subway on January 11, 2015 in New York. The No Pants Subway Ride is an annual which was started in 2002 by ImprovA participant in the No Pants Subway Ride waits for a train next to police officers in New York subway on January 11, 2015 in New York. The No Pants Subway Ride is an annual which was started in 2002 by Improv Everywhere in New York, the goal is for riders to get on the subway train dressed in normal winter clothes without pants and keep a straight face. AFP PHOTO / TIMOTHY A. CLARY

Photo: TIMOTHY A. CLARY, Getty Images

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A participant in the No Pants Subway Ride waits for a train in her underwear in New York subway on January 11, 2015 in New York. The No Pants Subway Ride is an annual which was started in 2002 by ImprovA participant in the No Pants Subway Ride waits for a train in her underwear in New York subway on January 11, 2015 in New York. The No Pants Subway Ride is an annual which was started in 2002 by Improv Everywhere in New York, the goal is for riders to get on the subway train dressed in normal winter clothes without pants and keep a straight face. AFP PHOTO / TIMOTHY A. CLARY

Photo: MANDEL NGAN, Getty Images

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Participants in the No Pants Subway Ride DC get help with directions from a passenger on a train on January 11, 2015 in Washington, DC. The No Pants Subway Ride was in an annual event which was started in 2002Participants in the No Pants Subway Ride DC get help with directions from a passenger on a train on January 11, 2015 in Washington, DC. The No Pants Subway Ride was in an annual event which was started in 2002 by Improv Everywhere in New York. AFP PHOTO/Mandel NGAN

Photo: TIMOTHY A. CLARY, Getty Images

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Some participants in the No Pants Subway Ride wait for a train in their underwear in New York subway on January 11, 2015 in New York. The No Pants Subway Ride is an annual which was started in 2002 by ImprovSome participants in the No Pants Subway Ride wait for a train in their underwear in New York subway on January 11, 2015 in New York. The No Pants Subway Ride is an annual which was started in 2002 by Improv Everywhere in New York, the goal is for riders to get on the subway train dressed in normal winter clothes without pants and keep a straight face. AFP PHOTO / TIMOTHY A. CLARY

Photo: TIMOTHY A. CLARY, Getty Images

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A participant in the No Pants Subway Ride waits for a train in her underwear in New York subway on January 11, 2015 in New York. The No Pants Subway Ride is an annual which was started in 2002 by ImprovA participant in the No Pants Subway Ride waits for a train in her underwear in New York subway on January 11, 2015 in New York. The No Pants Subway Ride is an annual which was started in 2002 by Improv Everywhere in New York, the goal is for riders to get on the subway train dressed in normal winter clothes without pants and keep a straight face. AFP PHOTO / TIMOTHY A. CLARY

Photo: TIMOTHY A. CLARY, Getty Images

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Commuters laugh around a participant in the No Pants Subway Ride in his underwear in New York subway on January 11, 2015 in New York. The No Pants Subway Ride is an annual which was started in 2002 by ImprovCommuters laugh around a participant in the No Pants Subway Ride in his underwear in New York subway on January 11, 2015 in New York. The No Pants Subway Ride is an annual which was started in 2002 by Improv Everywhere in New York, the goal is for riders to get on the subway train dressed in normal winter clothes without pants and keep a straight face. AFP PHOTO / TIMOTHY A. CLARY

Photo: TIMOTHY A. CLARY, Getty Images

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A participant in the No Pants Subway Ride waits for a train in her underwear in New York subway on January 11, 2015 in New York. The No Pants Subway Ride is an annual which was started in 2002 by ImprovA participant in the No Pants Subway Ride waits for a train in her underwear in New York subway on January 11, 2015 in New York. The No Pants Subway Ride is an annual which was started in 2002 by Improv Everywhere in New York, the goal is for riders to get on the subway train dressed in normal winter clothes without pants and keep a straight face. AFP PHOTO / TIMOTHY A. CLARY

Photo: TIMOTHY A. CLARY, Getty Images

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A participant in the No Pants Subway Ride poses for pictures in her underwear in New York subway on January 11, 2015 in New York. The No Pants Subway Ride is an annual which was started in 2002 by ImprovA participant in the No Pants Subway Ride poses for pictures in her underwear in New York subway on January 11, 2015 in New York. The No Pants Subway Ride is an annual which was started in 2002 by Improv Everywhere in New York, the goal is for riders to get on the subway train dressed in normal winter clothes without pants and keep a straight face. AFP PHOTO / TIMOTHY A. CLARY

Photo: TIMOTHY A. CLARY, Getty Images

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Some participants in the No Pants Subway Ride wait for a train in their underwear in New York subway on January 11, 2015 in New York. The No Pants Subway Ride is an annual which was started in 2002 by ImprovSome participants in the No Pants Subway Ride wait for a train in their underwear in New York subway on January 11, 2015 in New York. The No Pants Subway Ride is an annual which was started in 2002 by Improv Everywhere in New York, the goal is for riders to get on the subway train dressed in normal winter clothes without pants and keep a straight face. AFP PHOTO / TIMOTHY A. CLARY

Photo: TIMOTHY A. CLARY, Getty Images

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Some participants in the No Pants Subway Ride wait for a train in their underwear in New York subway on January 11, 2015 in New York. The No Pants Subway Ride is an annual which was started in 2002 by ImprovSome participants in the No Pants Subway Ride wait for a train in their underwear in New York subway on January 11, 2015 in New York. The No Pants Subway Ride is an annual which was started in 2002 by Improv Everywhere in New York, the goal is for riders to get on the subway train dressed in normal winter clothes without pants and keep a straight face. AFP PHOTO / TIMOTHY A. CLARY

Photo: TIMOTHY A. CLARY, Getty Images

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Some riders in their underwear take part in the No Pants Subway Ride in New York subway on January 11, 2015 in New York. The No Pants Subway Ride is an annual which was started in 2002 by Improv Everywhere inSome riders in their underwear take part in the No Pants Subway Ride in New York subway on January 11, 2015 in New York. The No Pants Subway Ride is an annual which was started in 2002 by Improv Everywhere in New York, the goal is for riders to get on the subway train dressed in normal winter clothes without pants and keep a straight face. AFP PHOTO / TIMOTHY A. CLARY

Photo: TIMOTHY A. CLARY, Getty Images

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Some participants in their underwear take part in the No Pants Subway Ride in New York subway on January 11, 2015 in New York. The No Pants Subway Ride is an annual which was started in 2002 by ImprovSome participants in their underwear take part in the No Pants Subway Ride in New York subway on January 11, 2015 in New York. The No Pants Subway Ride is an annual which was started in 2002 by Improv Everywhere in New York, the goal is for riders to get on the subway train dressed in normal winter clothes without pants and keep a straight face. AFP PHOTO / TIMOTHY A. CLARY

Photo: TIMOTHY A. CLARY, Getty Images

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Some participants in their underwear take part in the No Pants Subway Ride in New York subway on January 11, 2015 in New York. The No Pants Subway Ride is an annual which was started in 2002 by ImprovSome participants in their underwear take part in the No Pants Subway Ride in New York subway on January 11, 2015 in New York. The No Pants Subway Ride is an annual which was started in 2002 by Improv Everywhere in New York, the goal is for riders to get on the subway train dressed in normal winter clothes without pants and keep a straight face. AFP PHOTO / TIMOTHY A. CLARY

Photo: TIMOTHY A. CLARY, Getty Images

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Some participants in the No Pants Subway Ride wait for a train in their underwear in New York subway on January 11, 2015 in New York. The No Pants Subway Ride is an annual which was started in 2002 by ImprovSome participants in the No Pants Subway Ride wait for a train in their underwear in New York subway on January 11, 2015 in New York. The No Pants Subway Ride is an annual which was started in 2002 by Improv Everywhere in New York, the goal is for riders to get on the subway train dressed in normal winter clothes without pants and keep a straight face. AFP PHOTO / TIMOTHY A. CLARY

Photo: TIMOTHY A. CLARY, Getty Images

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A participant in the No Pants Subway Ride in her underwear enters the New York subway on January 11, 2015 in New York. The No Pants Subway Ride is an annual which was started in 2002 by Improv Everywhere inA participant in the No Pants Subway Ride in her underwear enters the New York subway on January 11, 2015 in New York. The No Pants Subway Ride is an annual which was started in 2002 by Improv Everywhere in New York, the goal is for riders to get on the subway train dressed in normal winter clothes without pants and keep a straight face. AFP PHOTO / TIMOTHY A. CLARY

What started out as a viral prank years ago has turned into a goofy world phenomenon.

On Sunday in cities across the world, people decked out in their best undies hit public transportation hubs and rode in breezy style.